linux-kernel - Re: [PATCH] add iommu_num

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Message-ID: <20080729102655.GC4851@amd.com>
Date:	Tue, 29 Jul 2008 12:26:55 +0200
From:	Joerg Roedel <joerg.roedel@....com>
To:	David Miller <davem@...emloft.net>
CC:	sfr@...b.auug.org.au, fujita.tomonori@....ntt.co.jp, 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 Tue, Jul 29, 2008 at 03:10:05AM -0700, David Miller wrote:
> From: Joerg Roedel <joerg.roedel@....com>
> Date: Tue, 29 Jul 2008 11:50:27 +0200
> 
> > I think moving that function to x86-only code is the best solution for
> > now. Before moving it back to generic code we need an architecture
> > independent way to find out the IOMMU page size.
> 
> My suggestion (again) is to pass it in as a "const unsigned long
> io_page_size" argument and update the callers.

Ok, this has the advantage that it supports more than one IOMMU page
size per architecture and its also less intrusive.

Joerg

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