linux-kernel - Re: [PATCH] xtensa: implement arch_dma_coherent_to

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Message-ID: <CAMo8BfLz5R=nXb3Ycw-xs9qfxHjBiKS2--mS3pr7=7rgwBeO_Q@mail.gmail.com>
Date:   Wed, 16 Oct 2019 00:40:45 -0700
From:   Max Filippov <jcmvbkbc@...il.com>
To:     Christoph Hellwig <hch@....de>
Cc:     "open list:TENSILICA XTENSA PORT (xtensa)" 
        <linux-xtensa@...ux-xtensa.org>, Chris Zankel <chris@...kel.net>,
        LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] xtensa: implement arch_dma_coherent_to_pfn

Hi Christoph,

On Wed, Oct 16, 2019 at 12:08 AM Christoph Hellwig <hch@....de> wrote:
> On Tue, Oct 15, 2019 at 02:25:26PM -0700, Max Filippov wrote:
> > Add trivial implementation for arch_dma_coherent_to_pfn.
> > This change enables communication with PCI ALSA devices through mmapped
> > buffers.
>
> This looks fine, although I'd much rather convert xtensa to the
> generic DMA remap / uncached segment support.

Thanks for the review.

> Do you want this fix for 5.4?  If so please queue it up ASAP so that
> I can do the proper thing for 5.5.  If you don't need it that urgent
> I'd rather go straight to the generic code.

There's no rush, I'll keep my version privately and will switch to the
generic version once it's available.

-- 
Thanks.
-- Max