linux-kernel - Re: [PATCH v10 3/6] riscv: mm: dma-noncoherent: nonstandard cache operations support

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Message-ID: <20230731-tribute-splashing-6a90f443cefe@wendy>
Date:   Mon, 31 Jul 2023 12:38:37 +0100
From:   Conor Dooley <conor.dooley@...rochip.com>
To:     "Lad, Prabhakar" <prabhakar.csengg@...il.com>
CC:     Jisheng Zhang <jszhang@...nel.org>, Arnd Bergmann <arnd@...db.de>,
        Geert Uytterhoeven <geert+renesas@...der.be>,
        Guo Ren <guoren@...nel.org>,
        Andrew Jones <ajones@...tanamicro.com>,
        Paul Walmsley <paul.walmsley@...ive.com>,
        Palmer Dabbelt <palmer@...belt.com>,
        Albert Ou <aou@...s.berkeley.edu>,
        Samuel Holland <samuel@...lland.org>,
        <linux-riscv@...ts.infradead.org>,
        Christoph Hellwig <hch@...radead.org>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        <devicetree@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <linux-renesas-soc@...r.kernel.org>,
        Biju Das <biju.das.jz@...renesas.com>,
        Lad Prabhakar <prabhakar.mahadev-lad.rj@...renesas.com>
Subject: Re: [PATCH v10 3/6] riscv: mm: dma-noncoherent: nonstandard cache
 operations support

On Mon, Jul 31, 2023 at 12:30:43PM +0100, Lad, Prabhakar wrote:
> On Sun, Jul 30, 2023 at 4:09 PM Jisheng Zhang <jszhang@...nel.org> wrote:
> > On Sun, Jul 02, 2023 at 09:34:26PM +0100, Prabhakar wrote:
> > > From: Lad Prabhakar <prabhakar.mahadev-lad.rj@...renesas.com>

> > > +config RISCV_NONSTANDARD_CACHE_OPS
> > > +     bool
> > > +     depends on RISCV_DMA_NONCOHERENT
> > > +     help
> > > +       This enables function pointer support for non-standard noncoherent
> > > +       systems to handle cache management.
> >
> > Per Documentation/riscv/patch-acceptance.rst:
> >
> > "we'll only consider patches for extensions that either:
> >
> > - Have been officially frozen or ratified by the RISC-V Foundation, or
> > - Have been implemented in hardware that is widely available, per standard
> >   Linux practice."
> >
> > I'm not sure which item this patch series belongs to.
> >
> Maybe Conor can help me here ;)

I'm not entirely sure why you need my help, it's your company that
manufactures the SoC that needs this after all.. I think Emil already
pointed out that it was the latter of the two. I guess it is not an
"extension" in the strictest sense of the word, but it fills the same
gap as one, so /shrug.

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