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Date:   Tue, 19 May 2020 17:42:13 +0200
From:   Thomas Bogendoerfer <tsbogend@alpha.franken.de>
To:     Sergey.Semin@baikalelectronics.ru
Cc:     Serge Semin <fancer.lancer@gmail.com>,
        Alexey Malahov <Alexey.Malahov@baikalelectronics.ru>,
        Paul Burton <paulburton@kernel.org>,
        Ralf Baechle <ralf@linux-mips.org>,
        Arnd Bergmann <arnd@arndb.de>,
        Rob Herring <robh+dt@kernel.org>, linux-pm@vger.kernel.org,
        devicetree@vger.kernel.org,
        Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        Allison Randal <allison@lohutok.net>,
        Thomas Gleixner <tglx@linutronix.de>,
        Zhou Yanjie <zhouyanjie@zoho.com>,
        Paul Cercueil <paul@crapouillou.net>,
        Jiaxun Yang <jiaxun.yang@flygoat.com>,
        Mike Rapoport <rppt@linux.ibm.com>,
        Andrew Morton <akpm@linux-foundation.org>,
        linux-mips@vger.kernel.org, linux-kernel@vger.kernel.org
Subject: Re: [PATCH v2 12/20] mips: MAAR: Add XPA mode support
Message-ID: <20200519154213.GA15797@alpha.franken.de>
References: <20200306124807.3596F80307C2@mail.baikalelectronics.ru>
 <20200506174238.15385-1-Sergey.Semin@baikalelectronics.ru>
 <20200506174238.15385-13-Sergey.Semin@baikalelectronics.ru>
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On Wed, May 06, 2020 at 08:42:30PM +0300, Sergey.Semin@baikalelectronics.ru wrote:
> From: Serge Semin <Sergey.Semin@baikalelectronics.ru>
> 
> When XPA mode is enabled the normally 32-bits MAAR pair registers
> are extended to be of 64-bits width as in pure 64-bits MIPS
> architecture. In this case the MAAR registers can enable the
> speculative loads/stores for addresses of up to 39-bits width.
> But in this case the process of the MAAR initialization changes a bit.
> The upper 32-bits of the registers are supposed to be accessed by mean
> of the dedicated instructions mfhc0/mthc0 and there is a CP0.MAAR.VH
> bit which should be set together with CP0.MAAR.VL as indication
> of the boundary validity. All of these peculiarities were taken into
> account in this commit so the speculative loads/stores would work
> when XPA mode is enabled.
> 
> Co-developed-by: Alexey Malahov <Alexey.Malahov@baikalelectronics.ru>
> Signed-off-by: Alexey Malahov <Alexey.Malahov@baikalelectronics.ru>
> Signed-off-by: Serge Semin <Sergey.Semin@baikalelectronics.ru>
> Cc: Thomas Bogendoerfer <tsbogend@alpha.franken.de>
> Cc: Paul Burton <paulburton@kernel.org>
> Cc: Ralf Baechle <ralf@linux-mips.org>
> Cc: Arnd Bergmann <arnd@arndb.de>
> Cc: Rob Herring <robh+dt@kernel.org>
> Cc: linux-pm@vger.kernel.org
> Cc: devicetree@vger.kernel.org
> ---
>  arch/mips/include/asm/maar.h     | 17 +++++++++++++++--
>  arch/mips/include/asm/mipsregs.h | 10 ++++++++++
>  arch/mips/mm/init.c              |  8 +++++++-
>  3 files changed, 32 insertions(+), 3 deletions(-)

applied to mips-next.

Thomas.

-- 
Crap can work. Given enough thrust pigs will fly, but it's not necessarily a
good idea.                                                [ RFC1925, 2.3 ]