linux-kernel - Re: [RFC PATCH 6/6] sparc64: Enable 64-bit DMA

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Message-ID: <20161007073252.GA8290@infradead.org>
Date:   Fri, 7 Oct 2016 00:32:52 -0700
From:   Christoph Hellwig <hch@...radead.org>
To:     Tushar Dave <tushar.n.dave@...cle.com>
Cc:     davem@...emloft.net, chris.hyser@...cle.com,
        sowmini.varadhan@...cle.com, vgupta@...opsys.com,
        robin.murphy@....com, jroedel@...e.de, egtvedt@...fundet.no,
        krzk@...nel.org, sparclinux@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [RFC PATCH 6/6] sparc64: Enable 64-bit DMA

On Thu, Oct 06, 2016 at 04:33:36PM -0700, Tushar Dave wrote:
> ATU 64bit addressing allows PCIe devices with 64bit DMA capabilities
> to use ATU for 64bit DMA.

Any chance to always enable this?  Last I checked sparc was the only
architecture still using a 32-bit dma_addr_t, leading to some fun
breakage in things like the software RDMA drivers that abuse it to
store a kernel pointer..