Re: [PATCH v2 1/2] [RFC] ARM: IOMMU: Tegra20: iommu_ops for GARTdriver

[Hiroshi Doyu]

Hi Joerg, Thank you for your quick review.

From: Joerg Roedel <joerg.roedel@xxxxxxx>
Subject: Re: [PATCH v2 1/2] [RFC] ARM: IOMMU: Tegra20: iommu_ops for GART driver
Date: Fri, 16 Dec 2011 16:43:31 +0100
Message-ID: <20111216154331.GD29877@xxxxxxx>

> On Thu, Dec 15, 2011 at 03:11:29PM +0200, Hiroshi DOYU wrote:
> > Tegra 20 IOMMU H/W, GART (Graphics Address Relocation Table). This
> > patch implements struct iommu_ops for GART for the upper IOMMU API.
> > 
> > This H/W module supports only single virtual address space(domain),
> > and manages a single level 1-to-1 mapping H/W translation page table.
> > 
> > Signed-off-by: Hiroshi DOYU <hdoyu@xxxxxxxxxx>
> > ---
> >  drivers/iommu/Kconfig      |   11 +
> >  drivers/iommu/Makefile     |    1 +
> >  drivers/iommu/tegra-gart.c |  451 ++++++++++++++++++++++++++++++++++++++++++++
> 
> The code looks good in general.

Thanks.

> I think we need to extend the IOMMU-API
> a little bit to better support GART IOMMUs. A user of the IOMMU-API
> should be able to get the information about the iova-base and size of
> the aperture for example. These extensions will be beneficial for
> porting other GART-like driver to the IOMMU-API too.

is it similar to how ".pgsize_bitmap" is passed?

> 
> 
> 	Joerg
> 
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