linux-kernel - Re: [PATCH RFC 0/3] riscv: Add DMA

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Date:   Wed, 19 May 2021 08:56:58 +0200
From:   Christoph Hellwig <hch@....de>
To:     Drew Fustini <drew@...gleboard.org>
Cc:     Christoph Hellwig <hch@....de>, Guo Ren <guoren@...nel.org>,
        Anup Patel <anup.patel@....com>,
        Palmer Dabbelt <palmerdabbelt@...gle.com>, wefu@...hat.com,
        lazyparser@...il.com,
        linux-riscv <linux-riscv@...ts.infradead.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        linux-arch <linux-arch@...r.kernel.org>,
        linux-sunxi@...ts.linux.dev, Guo Ren <guoren@...ux.alibaba.com>,
        paul.walmsley@...ive.com
Subject: Re: [PATCH RFC 0/3] riscv: Add DMA_COHERENT support

On Tue, May 18, 2021 at 11:54:31PM -0700, Drew Fustini wrote:
> Isn't it a good goal for Linux to support the capabilities present in
> the SoC that a currently being fab'd?
> 
> I believe the CMO group only started last year [1] so the RV64GC SoCs
> that are going into mass production this year would not have had the
> opporuntiy of utilizing any RISC-V ISA extension for handling cache
> management.

Then the vendors need to push harder.  This problem has been known
for years but ignored by the vendors.