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

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Message-ID: <ZEDXAV7EJn9MH0Hd@infradead.org>
Date:   Wed, 19 Apr 2023 23:09:05 -0700
From:   Christoph Hellwig <hch@...radead.org>
To:     Palmer Dabbelt <palmer@...belt.com>
Cc:     Christoph Hellwig <hch@...radead.org>,
        Conor Dooley <conor@...nel.org>, prabhakar.csengg@...il.com,
        Arnd Bergmann <arnd@...db.de>,
        Conor Dooley <conor.dooley@...rochip.com>,
        geert+renesas@...der.be, heiko@...ech.de, guoren@...nel.org,
        ajones@...tanamicro.com, Paul Walmsley <paul.walmsley@...ive.com>,
        aou@...s.berkeley.edu, samuel@...lland.org,
        linux-riscv@...ts.infradead.org, robh+dt@...nel.org,
        krzysztof.kozlowski+dt@...aro.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-renesas-soc@...r.kernel.org,
        biju.das.jz@...renesas.com, prabhakar.mahadev-lad.rj@...renesas.com
Subject: Re: [PATCH v8 0/7] Add non-coherent DMA support for AX45MP

On Wed, Apr 19, 2023 at 08:59:03AM -0700, Palmer Dabbelt wrote:
> IMO we should just take the support in Linux: trying to hide stuff behind the
> SBI leads to more more headaches than it's worth, we end up with a bunch of
> broken firmware to try and work around.  We've already got a mess here because
> of the D1 support, we might as well just live with it.

I strongly disagree.  Adding more and more per-vendor ops simply does
not scale.  We're getting us into a giant long-time mess that will be
unfixable.