From: Will Deacon <will.deacon@arm.com>
To: David Daney <ddaney.cavm@gmail.com>
Cc: linux-arm-kernel@lists.infradead.org,
Mark Rutland <mark.rutland@arm.com>,
Catalin Marinas <catalin.marinas@arm.com>,
Marc Zyngier <marc.zyngier@arm.com>,
linux-kernel@vger.kernel.org, Andrew Pinski <apinski@cavium.com>,
David Daney <david.daney@cavium.com>
Subject: Re: [PATCH] arm64: Add workaround for Cavium erratum 27456
Date: Wed, 10 Feb 2016 09:28:23 +0000 [thread overview]
Message-ID: <20160210092822.GA1052@arm.com> (raw)
In-Reply-To: <1455046156-10582-1-git-send-email-ddaney.cavm@gmail.com>
On Tue, Feb 09, 2016 at 11:29:16AM -0800, David Daney wrote:
> From: Andrew Pinski <apinski@cavium.com>
>
> On ThunderX T88 pass 1.x through 2.1 parts, broadcast TLBI
> instructions may cause the icache to become invalid if it contains
> data for a non-current ASID.
>
> This patch implements the workaround (which flushes the local icache
> when switching the mm) by using code patching.
So, to be clear, is this "just" a performance problem as opposed to a
correctness issue? If so, do you have any numbers with and without this
change?
Will
WARNING: multiple messages have this Message-ID (diff)
From: will.deacon@arm.com (Will Deacon)
To: linux-arm-kernel@lists.infradead.org
Subject: [PATCH] arm64: Add workaround for Cavium erratum 27456
Date: Wed, 10 Feb 2016 09:28:23 +0000 [thread overview]
Message-ID: <20160210092822.GA1052@arm.com> (raw)
In-Reply-To: <1455046156-10582-1-git-send-email-ddaney.cavm@gmail.com>
On Tue, Feb 09, 2016 at 11:29:16AM -0800, David Daney wrote:
> From: Andrew Pinski <apinski@cavium.com>
>
> On ThunderX T88 pass 1.x through 2.1 parts, broadcast TLBI
> instructions may cause the icache to become invalid if it contains
> data for a non-current ASID.
>
> This patch implements the workaround (which flushes the local icache
> when switching the mm) by using code patching.
So, to be clear, is this "just" a performance problem as opposed to a
correctness issue? If so, do you have any numbers with and without this
change?
Will
next prev parent reply other threads:[~2016-02-10 9:28 UTC|newest]
Thread overview: 18+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-02-09 19:29 [PATCH] arm64: Add workaround for Cavium erratum 27456 David Daney
2016-02-09 19:29 ` David Daney
2016-02-09 19:52 ` Marc Zyngier
2016-02-09 19:52 ` Marc Zyngier
2016-02-09 19:59 ` David Daney
2016-02-09 19:59 ` David Daney
2016-02-09 20:07 ` Marc Zyngier
2016-02-09 20:07 ` Marc Zyngier
2016-02-10 9:28 ` Will Deacon [this message]
2016-02-10 9:28 ` Will Deacon
2016-02-10 18:08 ` David Daney
2016-02-10 18:08 ` David Daney
2016-02-10 18:15 ` Will Deacon
2016-02-10 18:15 ` Will Deacon
2016-02-10 18:42 ` David Daney
2016-02-10 18:42 ` David Daney
2016-02-11 13:07 ` Will Deacon
2016-02-11 13:07 ` Will Deacon
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