linux-kernel - removing addr_needs_map in struct dma_mapping

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Message-Id: <20090710104706I.fujita.tomonori@lab.ntt.co.jp>
Date:	Fri, 10 Jul 2009 10:47:37 +0900
From:	FUJITA Tomonori <fujita.tomonori@....ntt.co.jp>
To:	linuxppc-dev@...ts.ozlabs.org
Cc:	benh@...nel.crashing.org, galak@...nel.crashing.org,
	beckyb@...nel.crashing.org, linux-kernel@...r.kernel.org
Subject: removing addr_needs_map in struct dma_mapping_ops

I'm trying to convert POWERPC to use asm-generic/dma-mapping-common.h.

POWERPC needs addr_needs_map() in struct dma_mapping_ops for SWIOTLB
support but I want to avoid add addr_needs_map() in struct
dma_map_ops. IIRC, you guys think it as a temporary solution and
talked about defining something like struct dma_data. Then we could

struct dev_archdata {
       ...

       struct dma_data *ddata;
};

or

struct dev_archdata {
       ...

       struct dma_data ddata;
};

struct dma_data needs dma_direct_offset, iommu_table, dma_base, and
dma_window_size, anything else?

Is it acceptable?
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