linux-kernel - Re: [PATCH v8 0/7] Add non-coherent DMA support for AX45MP

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Date:   Sun, 16 Apr 2023 23:53:17 -0700
From:   Christoph Hellwig <hch@...radead.org>
To:     Conor Dooley <conor@...nel.org>
Cc:     Prabhakar <prabhakar.csengg@...il.com>,
        Arnd Bergmann <arnd@...db.de>,
        Conor Dooley <conor.dooley@...rochip.com>,
        Geert Uytterhoeven <geert+renesas@...der.be>,
        Heiko Stuebner <heiko@...ech.de>, 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, 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 v8 0/7] Add non-coherent DMA support for AX45MP

On Wed, Apr 12, 2023 at 09:32:30PM +0100, Conor Dooley wrote:
> On Wed, Apr 12, 2023 at 12:08:53PM +0100, Prabhakar wrote:
> 
> > Note,
> > - This series requires testing on Cores with zicbom and T-Head SoCs
> 
> As I said last time, I dunno what actual Zicbom stuff exists, other than
> perhaps the Ventana lads having something. I did some tyre kicking on my
> D1 and it was fine, although nothing has actually changed materially for
> either of them with this series in v8..

And as saying before, there is absolutely no reason to add non-standard
non-coherent DMA support and let this cancer creep.  If you want Linux
support implement Zicbom, be that in hardware or the SBI.