linux-kernel - Re: [RFC PATCH] m68k: set dma and coherent masks for Macintosh SONIC based ethernet

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Date:   Tue, 29 May 2018 15:38:23 +1000 (AEST)
From:   Finn Thain <fthain@...egraphics.com.au>
To:     Michael Schmitz <schmitzmic@...il.com>
cc:     Geert Uytterhoeven <geert@...ux-m68k.org>,
        Christoph Hellwig <hch@....de>,
        Guenter Roeck <linux@...ck-us.net>,
        Joshua Thompson <funaho@...ai.org>,
        Greg Ungerer <gerg@...ux-m68k.org>,
        linux-m68k <linux-m68k@...ts.linux-m68k.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [RFC PATCH] m68k: set dma and coherent masks for Macintosh SONIC
 based ethernet

On Tue, 29 May 2018, Michael Schmitz wrote:

> > 
> > Since an arch gets to apply limits in the dma ops it implements, why 
> > would arch code also have to set a limit in the form of default 
> > platform device masks? Powerpc seems to be the only arch that does 
> > this.
> 
> One of Christoph's recent patches removed most of arches' dma ops, 
> replacing them by one generic implementation instead. m68k was one of 
> the affected arches. I concede his patch series is experimental still 
> and not in mainline, but may be included at some time.

I found some patches here,
http://git.infradead.org/users/hch/misc.git/shortlog/refs/heads/generic-dma-noncoherent.2

Looks like m68k_dma_alloc() gets renamed arch_dma_alloc() and the generic 
ops don't use the dma masks.

Maybe I'm looking at the wrong patches?

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