linux-kernel - Re: [PATCH v2 11/20] mips: MAAR: Use more precise address mask

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Message-ID: <20200507110951.GD11616@alpha.franken.de>
Date:   Thu, 7 May 2020 13:09:51 +0200
From:   Thomas Bogendoerfer <tsbogend@...ha.franken.de>
To:     Sergey.Semin@...kalelectronics.ru
Cc:     Serge Semin <fancer.lancer@...il.com>,
        Alexey Malahov <Alexey.Malahov@...kalelectronics.ru>,
        Paul Burton <paulburton@...nel.org>,
        Ralf Baechle <ralf@...ux-mips.org>,
        Arnd Bergmann <arnd@...db.de>,
        Rob Herring <robh+dt@...nel.org>, linux-pm@...r.kernel.org,
        devicetree@...r.kernel.org, Zhou Yanjie <zhouyanjie@...o.com>,
        Paul Cercueil <paul@...pouillou.net>,
        Jiaxun Yang <jiaxun.yang@...goat.com>,
        linux-mips@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 11/20] mips: MAAR: Use more precise address mask

On Wed, May 06, 2020 at 08:42:29PM +0300, Sergey.Semin@...kalelectronics.ru wrote:
> From: Serge Semin <Sergey.Semin@...kalelectronics.ru>
> 
> Indeed according to the P5600/P6000 manual the MAAR pair register
> address field either takes [12:31] bits for 32-bits non-XPA systems
> and [12:35] otherwise. In any case the current address mask is just
> wrong for 64-bit and 32-bits XPA chips. So lets extend it to 39-bits
> value. This shall cover the 64-bits architecture and systems with XPA
> enabled, and won't cause any problem for non-XPA 32-bit systems, since
> the value will be just truncated when written to the 32-bits register.

according to MIPS32 Priveleged Resoure Architecture Rev. 6.02
ADDR spans from bit 12 to bit 55. So your patch fits only for P5600.
Does the wider mask cause any problems ?

Thomas.

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