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

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Date:   Thu, 23 Sep 2021 20:05:28 +0800
From:   Guo Ren <guoren@...nel.org>
To:     Nick Kossifidis <mick@....forth.gr>
Cc:     Philipp Tomsich <philipp.tomsich@...ll.eu>,
        Anup Patel <anup@...infault.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>,
        Daniel Lustig <dlustig@...dia.com>,
        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

On Thu, Sep 23, 2021 at 6:09 PM Nick Kossifidis <mick@....forth.gr> wrote:
>
> 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.

It should be another patch.

-- 
Best Regards
 Guo Ren

ML: https://lore.kernel.org/linux-csky/