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

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Message-ID: <CA+V-a8uHAQBZJBVtLbhxczwAAZYcVSRz+CGoQX0EmPDU5OxEFA@mail.gmail.com>
Date:   Mon, 31 Jul 2023 12:45:08 +0100
From:   "Lad, Prabhakar" <prabhakar.csengg@...il.com>
To:     Conor Dooley <conor.dooley@...rochip.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

Hi Conor,

On Mon, Jul 31, 2023 at 12:39 PM Conor Dooley
<conor.dooley@...rochip.com> wrote:
>
> 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.
>
Aaha I was wondering If there had to be an additional entry here to
fit this case, but if it already does fit in ignore me. Thanks for the
clarification.

Cheers,
Prabhakar