linux-kernel - Re: [PATCH] add iommu_num

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Date:	Thu, 31 Jul 2008 11:07:49 +0900
From:	FUJITA Tomonori <fujita.tomonori@....ntt.co.jp>
To:	benh@...nel.crashing.org
Cc:	joerg.roedel@....com, fujita.tomonori@....ntt.co.jp,
	sfr@...b.auug.org.au, davem@...emloft.net, mingo@...e.hu,
	mingo@...hat.com, tglx@...utronix.de, linux-kernel@...r.kernel.org,
	iommu@...ts.linux-foundation.org, bhavna.sarathy@....com,
	robert.richter@....com, torvalds@...ux-foundation.org,
	akpm@...ux-foundation.org, jbarnes@...tuousgeek.org,
	linux-next@...r.kernel.org
Subject: Re: [PATCH] add iommu_num_pages helper function

On Thu, 31 Jul 2008 08:44:14 +1000
Benjamin Herrenschmidt <benh@...nel.crashing.org> wrote:

> On Tue, 2008-07-29 at 12:02 +0200, Joerg Roedel wrote:
> > On Tue, Jul 29, 2008 at 06:58:08PM +0900, FUJITA Tomonori wrote:
> > > On Tue, 29 Jul 2008 11:50:27 +0200
> > > Joerg Roedel <joerg.roedel@....com> wrote:
> > > > do you want to work on that or should I try to do this and send it to
> > > > you for review?
> > > 
> > > I've already sent a patch that fixes the breakages in such way:
> > > 
> > > http://marc.info/?l=linux-kernel&m=121730644704448&w=2
> > 
> > Yes I have seen this patch. I meant the patches that introduce something
> > like IOMMU_PAGE_SIZE for all architectures so that we can make this
> > function generic and move it back to lib/.
> 
> That will not work in the light of some new stuff coming on powerpc in
> the future. The iommu page size may/will be dynamic per instance of
> iommu. IE, it will be mostly decided at runtime, I don't expect machines
> to have multiple iommus of different page sizes off hand but it -can-
> happen.

You could do something like this:

#define IOMMU_PAGE_SIZE	power_iommu_page_size

But I prefer the current proposal to have the size as an argument.
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