linux-kernel - Re: [PATCH 3/5] Move dma_ops from archdata into struct device

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Message-ID: <1481310814.98151.11.camel@infradead.org>
Date:   Fri, 09 Dec 2016 19:13:34 +0000
From:   David Woodhouse <dwmw2@...radead.org>
To:     Christoph Hellwig <hch@....de>,
        Bart Van Assche <bart.vanassche@...disk.com>
Cc:     Doug Ledford <dledford@...hat.com>,
        Sagi Grimberg <sagi@...mberg.me>,
        "linux-rdma@...r.kernel.org" <linux-rdma@...r.kernel.org>,
        virtualization@...ts.linux-foundation.org,
        linux-arch@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 3/5] Move dma_ops from archdata into struct device

On Fri, 2016-12-09 at 19:22 +0100, Christoph Hellwig wrote:
> We'll need a bit of a wieder audience for this I think..
> 
> On Wed, Dec 07, 2016 at 05:11:28PM -0800, Bart Van Assche wrote:
> > Additionally, introduce set_dma_ops(). A later patch will introduce a
> > call to that function in the RDMA drivers that will be modified to use
> > dma_noop_ops.
> 
> This looks good to me, and we had a lot of talk about this for other
> purposes for a while. 

Hm, I'm not convinced we want per-device dma_ops. What we want is per-
device IOMMU ops, and any dma_ops are just a generic or platform-
specific (in some cases) wrapper around those. We shouldn't normally
need per-device DMA ops at all.

-- 
dwmw2
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