linux-kernel - Re: [PATCH 18/23] AMD IOMMU: simplify dma_mask_to

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Date:	Fri, 19 Sep 2008 00:57:36 +0900
From:	FUJITA Tomonori <fujita.tomonori@....ntt.co.jp>
To:	joerg.roedel@....com
Cc:	fujita.tomonori@....ntt.co.jp, linux-kernel@...r.kernel.org,
	iommu@...ts.linux-foundation.org
Subject: Re: [PATCH 18/23] AMD IOMMU: simplify dma_mask_to_pages

On Thu, 18 Sep 2008 09:32:32 +0200
Joerg Roedel <joerg.roedel@....com> wrote:

> On Thu, Sep 18, 2008 at 04:20:20AM +0900, FUJITA Tomonori wrote:
> > On Wed, 17 Sep 2008 18:52:52 +0200
> > Joerg Roedel <joerg.roedel@....com> wrote:
> > 
> > > The current calculation is very complicated. This patch replaces it with
> > > a much simpler version.
> > > 
> > > Signed-off-by: Joerg Roedel <joerg.roedel@....com>
> > > ---
> > >  arch/x86/kernel/amd_iommu.c |    3 +--
> > >  1 files changed, 1 insertions(+), 2 deletions(-)
> > 
> > I think that you can use iommu_device_max_index() for what
> > dma_mask_to_pages does.
> 
> Hmm, in theory yes. But iommu_device_max_index() returns a size in bytes
> and not in pages.

It doesn't return a size in bytes. You could use like:

limit = iommu_device_max_index(dom->aperture_size >> PAGE_SHIFT, 0,
				dma_get_mask(dev) >> PAGE_SHIFT);


Anyway, it's not urgent at all. I'll send a patch for this after your
patchset is merged.
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