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

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Date:   Tue, 11 Oct 2016 09:38:06 -0700
From:   Christoph Hellwig <hch@...radead.org>
To:     tndave <tushar.n.dave@...cle.com>
Cc:     Christoph Hellwig <hch@...radead.org>, 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

Hi Tushar,

On Fri, Oct 07, 2016 at 01:09:15AM -0700, tndave wrote:
> With change made by patch 6/6, dma_addr_t is always 64-bit, no matter if
> device DMA mask is 32-bit (i.e. using existing IOMMU) or 64-bit (i.e
> using ATU)

But only iff CONFIG_ARCH_ATU is set.  Anyway, I'll wait for your patches
to got in first and will then propose getting rid of
CONFIG_ARCH_DMA_ADDR_T_64BIT separately.