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

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Message-ID: <CAJF2gTSd273ZuRpgFZK-UKA=LgDHGEVrWdN8admScta-mF-Hvw@mail.gmail.com>
Date:   Wed, 19 May 2021 14:11:48 +0800
From:   Guo Ren <guoren@...nel.org>
To:     Christoph Hellwig <hch@....de>
Cc:     Anup Patel <anup.patel@....com>,
        Palmer Dabbelt <palmerdabbelt@...gle.com>,
        drew@...gleboard.org, 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>
Subject: Re: [PATCH RFC 0/3] riscv: Add DMA_COHERENT support

On Wed, May 19, 2021 at 2:06 PM Christoph Hellwig <hch@....de> wrote:
>
> On Wed, May 19, 2021 at 02:05:00PM +0800, Guo Ren wrote:
> > Since the existing RISC-V ISA cannot solve this problem, it is better
> > to provide some configuration for the SOC vendor to customize.
>
> We've been talking about this problem for close to five years.  So no,
> if you don't manage to get the feature into the ISA it can't be
> supported.

arch/riscv/errata/ is also defined in riscv ISA?

-- 
Best Regards
 Guo Ren

ML: https://lore.kernel.org/linux-csky/