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

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Date:   Fri, 27 Nov 2020 12:03:35 +0000
From:   Suzuki K Poulose <suzuki.poulose@....com>
To:     Wei Li <liwei391@...wei.com>,
        Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Anshuman Khandual <anshuman.khandual@....com>,
        Vincenzo Frascino <vincenzo.frascino@....com>,
        Marc Zyngier <maz@...nel.org>,
        Ionela Voinescu <ionela.voinescu@....com>,
        Ard Biesheuvel <ardb@...nel.org>,
        Amit Daniel Kachhap <amit.kachhap@....com>,
        Vladimir Murzin <vladimir.murzin@....com>
Cc:     linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        guohanjun@...wei.com
Subject: Re: [PATCH v3] drivers/perf: Add support for ARMv8.3-SPE

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@...wei.com>

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