linux-kernel - Re: [PATCH 0/5] IOMMU: Make IOMMU-API ready for GART-like hardware

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Message-ID: <20120120.081403.2268989617582455160.hdoyu@nvidia.com>
Date:	Fri, 20 Jan 2012 07:14:03 +0100
From:	Hiroshi Doyu <hdoyu@...dia.com>
To:	"joerg.roedel@....com" <joerg.roedel@....com>
CC:	"iommu@...ts.linux-foundation.org" <iommu@...ts.linux-foundation.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"ohad@...ery.com" <ohad@...ery.com>,
	"dwmw2@...radead.org" <dwmw2@...radead.org>,
	"davidb@...eaurora.org" <davidb@...eaurora.org>,
	"tony@...mide.com" <tony@...mide.com>,
	"Hiroshi.DOYU@...ia.com" <Hiroshi.DOYU@...ia.com>,
	"laurent.pinchart@...asonboard.com" 
	<laurent.pinchart@...asonboard.com>,
	"b08248@...il.com" <b08248@...il.com>,
	"scottwood@...escale.com" <scottwood@...escale.com>
Subject: Re: [PATCH 0/5] IOMMU: Make IOMMU-API ready for GART-like hardware

Hi Joerg,

From: Joerg Roedel <joerg.roedel@....com>
Subject: [PATCH 0/5] IOMMU: Make IOMMU-API ready for GART-like hardware
Date: Thu, 19 Jan 2012 15:30:00 +0100
Message-ID: <1326983405-319-1-git-send-email-joerg.roedel@....com>

> Hi,
> 
> this patch-set adds two new functions the the IOMMU-API:
> 
> 	* iommu_domain_set_attr()
> 	* iommu_domain_get_attr()
> 
> These are generic functions to set and change attributes of a domain.
> The plan is to have a set of generic attributes implemented by more than
> one IOMMU driver as well as driver specific ones. As an example for the
> first type this patch-set also implements the DOMAIN_ATTR_GEOMETRY
> attribute. It can be used to query information about the address space
> window that can be remapped by the iommu hardware. With this attribute
> is is very easy to support IOMMUs like GART and friends.

For Tegra GART & SMMU, this info is passed from board files as
resource data via "platform_get_resource(,IORESOURCE_MEM,)". I think
that this could be the attachement patch in Tegra case. The attached
patches are based on the following post.

https://lkml.org/lkml/2012/1/5/26
https://lkml.org/lkml/2012/1/5/27

View attachment "0001-iommu-tegra-gart-Implement-DOMAIN_ATTR_GEOMETRY-attr.patch" of type "text/x-patch" (1059 bytes)

View attachment "0002-iommu-tegra-smmu-Implement-DOMAIN_ATTR_GEOMETRY-attr.patch" of type "text/x-patch" (984 bytes)