linux-kernel - Re: [PATCH 0/3] arm64: perf: add support for Cortex-A55/A75/A76

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Message-ID: <20200703123346.GB18953@willie-the-truck>
Date:   Fri, 3 Jul 2020 13:33:47 +0100
From:   Will Deacon <will@...nel.org>
To:     Jisheng Zhang <Jisheng.Zhang@...aptics.com>
Cc:     Robin Murphy <robin.murphy@....com>,
        Mark Rutland <mark.rutland@....com>,
        Catalin Marinas <catalin.marinas@....com>,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 0/3] arm64: perf: add support for Cortex-A55/A75/A76

On Fri, Jun 19, 2020 at 06:44:37PM +0800, Jisheng Zhang wrote:
> The Cortex-A55/A75/A76 use some implementation defined perf events.
> Add the support.
> 
> Jisheng Zhang (3):
>   arm64: perf: add support for Cortex-A55
>   arm64: perf: add support for Cortex-A75
>   arm64: perf: add support for Cortex-A76
> 
>  arch/arm64/kernel/perf_event.c | 49 +++++++++++++++++++++++++++++++---
>  1 file changed, 45 insertions(+), 4 deletions(-)

Do we really need this? I'd prefer for this stuff to live in userspace
now that the perf tool has supported JSON event descriptions for a while,
and the in-kernel driver advertises the architected events advertised
by PMCEID*.

Will