linux-kernel - Re: [PATCH] riscv: Add RISC-V svpbmt extension

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Message-ID: <88696248a0c19a5dff660354b837514d@mailhost.ics.forth.gr>
Date:   Thu, 23 Sep 2021 13:09:45 +0300
From:   Nick Kossifidis <mick@....forth.gr>
To:     Philipp Tomsich <philipp.tomsich@...ll.eu>
Cc:     Nick Kossifidis <mick@....forth.gr>,
        Anup Patel <anup@...infault.org>, Guo Ren <guoren@...nel.org>,
        Anup Patel <anup.patel@....com>,
        Atish Patra <atish.patra@....com>,
        Palmer Dabbelt <palmerdabbelt@...gle.com>,
        Christoph Müllner <christoph.muellner@...ll.eu>,
        Christoph Hellwig <hch@....de>,
        liush <liush@...winnertech.com>, wefu@...hat.com,
        Wei Wu (吴伟) <lazyparser@...il.com>,
        Drew Fustini <drew@...gleboard.org>,
        linux-riscv <linux-riscv@...ts.infradead.org>,
        "linux-kernel@...r.kernel.org List" <linux-kernel@...r.kernel.org>,
        taiten.peng@...onical.com, aniket.ponkshe@...onical.com,
        Heinrich Schuchardt <heinrich.schuchardt@...onical.com>,
        gordan.markus@...onical.com, Guo Ren <guoren@...ux.alibaba.com>,
        Arnd Bergmann <arnd@...db.de>, Chen-Yu Tsai <wens@...e.org>,
        Maxime Ripard <maxime@...no.tech>,
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        Greg Favor <gfavor@...tanamicro.com>,
        Andrea Mondelli <andrea.mondelli@...wei.com>,
        Jonathan Behrens <behrensj@....edu>,
        Xinhaoqu <xinhaoqu@...wei.com>,
        Bill Huffman <huffman@...ence.com>,
        Allen Baum <allen.baum@...erantotech.com>,
        Josh Scheid <jscheid@...tanamicro.com>,
        Richard Trauben <rtrauben@...il.com>
Subject: Re: [PATCH] riscv: Add RISC-V svpbmt extension

Στις 2021-09-23 13:04, Philipp Tomsich έγραψε:
> 
> How if we expand this to a mmu subnode in cpu@x and add a booleans for 
> adornments like svnapot and svpbmt?
> The older mmu-type could then treated to indicate a mmu w/o any 
> adornments specified.  I am aware that this generates an additional 
> parsing-path that will be maintained, but it will allow future 
> properties to be grouped.
> 
> cpu@0 {
> ...
> mmu {
> type = "riscv,sv39";
> supports-svpbmt;
> }
> ...
> }

I was about to propose the same thing, we can do this now without 
breaking backwards compatibility, we don't really use mmu-type property 
at this point, we are either sv39 or nommu.