linux-kernel - Re: [PATCH 1/5] iommu/tegra: smmu: Add DMA window parser, of_get_dma

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Date:	Thu, 21 Jun 2012 00:57:55 -0600
From:	Stephen Warren <swarren@...dotorg.org>
To:	Hiroshi Doyu <hdoyu@...dia.com>
CC:	"joerg.roedel@....com" <joerg.roedel@....com>,
	"arnd@...db.de" <arnd@...db.de>,
	"iommu@...ts.linux-foundation.org" <iommu@...ts.linux-foundation.org>,
	"linux-tegra@...r.kernel.org" <linux-tegra@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"grant.likely@...retlab.ca" <grant.likely@...retlab.ca>,
	"rob.herring@...xeda.com" <rob.herring@...xeda.com>
Subject: Re: [PATCH 1/5] iommu/tegra: smmu: Add DMA window parser, of_get_dma_window()

On 06/21/2012 12:46 AM, Hiroshi Doyu wrote:
...
> There are the following 3 users of of_parse_dma_window() as below. All
> of them are IOMMU related, but they are architecture specific ones,
> not for the standard IOMMU API. I guess that the current trend is to
> convert Arch specific IOMMU API to the standard one basically.
> 
>   arch/powerpc/kernel/vio.c 	of_parse_dma_window(dev->dev.of_node, dma_window,
>   arch/powerpc/platforms/cell/iommu.c 	of_parse_dma_window(np, dma_window, &index, base, size);
>   arch/powerpc/platforms/pseries/iommu.c 	of_parse_dma_window(dn, dma_window, &tbl->it_index, &offset, &size);
> 
> I think that the common "dma-window" DT parser is necessary for the
> standard IOMMU because "dma-window" info is dealt as
> DOMAIN_ATTR_GEOMETRY in the following Joerg's patch too.
> 
>   [PATCH 0/5] IOMMU: Make IOMMU-API ready for GART-like hardware
>     https://lkml.org/lkml/2012/1/19/170
> 
> If it's ok to have of_get_dma_window() in "drivers/iommu/of_iommu.c",
> I'll post that version.

Sounds sane to me.
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