linux-kernel - Re: [PATCH] [v1] arch: arm: configs: gxp

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Message-ID: <7CDF8A66-14E4-47E7-A6D7-6CF0C6C62CC8@hpe.com>
Date:   Wed, 23 Mar 2022 01:01:39 +0000
From:   "Verdun, Jean-Marie" <verdun@....com>
To:     Arnd Bergmann <arnd@...db.de>
CC:     "Hawkins, Nick" <nick.hawkins@....com>,
        Russell King <linux@...linux.org.uk>,
        Joel Stanley <joel@....id.au>,
        Andrew Jeffery <andrew@...id.au>,
        Olof Johansson <olof@...om.net>,
        Linux ARM <linux-arm-kernel@...ts.infradead.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] [v1] arch: arm: configs: gxp_defconfig

Hi,

>    Unfortunately that is not possible at the moment, as this is a 'bool'
>    option rather than
>    a 'tristate'. I don't know if it might be possible to change that, but
>    this is probably
>    done for a good reason.

You are right.

>    I think it should be possible to detect this erratum at runtime, especially now
>    that we understand what the hardware issue is.

>    We should probably add a CONFIG_ARM_ERRATA_764319 Kconfig
>    option that controls whether a workaround is enabled or not. One
>    way that I think this can be handled is to have a custom inline asm
>    for the trapping register CP14 accesses, using a __ex_table fixup,
>    similar to what we do for trapping user space memory access.

I like this idea. Let me try to implement it and propose something.
Thanks for the feedbacks.

>    Another option would be to detect affected systems by the CPU
>    revision register or from some DT properties.

ARM might be able to provide that. Let me ask them

vejmarie