From: Tianjia Zhang <tianjia.zhang@linux.alibaba.com>
To: Marc Zyngier <maz@kernel.org>
Cc: Will Deacon <will@kernel.org>,
Catalin Marinas <catalin.marinas@arm.com>,
Jonathan Corbet <corbet@lwn.net>, Joey Gouly <joey.gouly@arm.com>,
Vincenzo Frascino <Vincenzo.Frascino@arm.com>,
Mark Brown <broonie@kernel.org>, Arnd Bergmann <arnd@arndb.de>,
Anshuman Khandual <anshuman.khandual@arm.com>,
Fuad Tabba <tabba@google.com>,
Mark Rutland <mark.rutland@arm.com>,
Vladimir Murzin <vladimir.murzin@arm.com>,
James Morse <james.morse@arm.com>,
Suzuki K Poulose <suzuki.poulose@arm.com>,
Mathieu Poirier <mathieu.poirier@linaro.org>,
linux-arm-kernel@lists.infradead.org, linux-doc@vger.kernel.org,
linux-kernel@vger.kernel.org
Subject: Re: [PATCH] arm64/sme: Add hwcap for Scalable Matrix Extension
Date: Fri, 15 Apr 2022 10:30:30 +0800 [thread overview]
Message-ID: <3c242430-9f6c-0e04-91fc-10132e88df99@linux.alibaba.com> (raw)
In-Reply-To: <875ynbc1je.wl-maz@kernel.org>
Hi Marc,
On 4/14/22 8:06 PM, Marc Zyngier wrote:
> On Thu, 14 Apr 2022 12:55:44 +0100,
> Tianjia Zhang <tianjia.zhang@linux.alibaba.com> wrote:
>>
>> Allow userspace to detect support for SME (Scalable Matrix Extension)
>> by providing a hwcap for it, using the official feature name FEAT_SME,
>> declared in ARM DDI 0487H.a specification.
>
> Err, not just that, for sure. What does this patch buys you on its
> own, given that the kernel doesn't implement anything yet and that all
> the SME instructions will UNDEF?
>
> [1] is the real deal.
>
> Thanks,
>
> M.
>
> [1] https://lore.kernel.org/r/20220408114328.1401034-1-broonie@kernel.org
>
Thanks for your suggestion, I have a very simple scenario, I can see
whether the SME feature is supported in cpuinfo, it seems impractical at
the moment.
Kind regards,
Tianjia
prev parent reply other threads:[~2022-04-15 2:30 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-04-14 11:55 [PATCH] arm64/sme: Add hwcap for Scalable Matrix Extension Tianjia Zhang
2022-04-14 12:02 ` Mark Brown
2022-04-15 2:25 ` Tianjia Zhang
2022-04-19 13:58 ` Mark Brown
2022-04-24 9:27 ` Tianjia Zhang
2022-04-14 12:06 ` Marc Zyngier
2022-04-15 2:30 ` Tianjia Zhang [this message]
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